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算法(Algorithms)第4版 练习 1.3.20
方法实现:
//1.3.20 /** * delete the kth element in a linked list, if it exists. * * @param k the kth element, it should larger than 1 * @throws IllegalArgumentException if k < 1 * @throws NoSuchElementException if the size of the list is less than k */ public Item delete(int k) { if(k < 1) throw new IllegalArgumentException("k must larger than 1"); Node<Item> precurrent = new Node<Item>(); precurrent.next = first; Item item; while(precurrent.next != null && k > 1) { precurrent = precurrent.next; k--; } if(precurrent.next == null) throw new NoSuchElementException("LinkedList hasn‘t so many elements"); item = precurrent.next.item; if(precurrent.next == first) first = precurrent.next.next; else precurrent.next = precurrent.next.next; return item; }
测试用例:
package com.qiusongde.linkedlist; import edu.princeton.cs.algs4.StdIn; import edu.princeton.cs.algs4.StdOut; public class Exercise1320 { public static void main(String[] args) { LinkedList<String> list = new LinkedList<String>(); while(!StdIn.isEmpty()) { String s = StdIn.readString(); list.insertAtBeginning(s); StdOut.println("insertAtBeginning success: " + s); StdOut.println(list); } int k = 5; String s = list.delete(k); StdOut.println("delete " + k + "th Element success: "+ s); StdOut.println(list); for(int i = 0; i < 4; i++) { k = 1; s = list.delete(k); StdOut.println("delete " + k + "th Element success: "+ s); StdOut.println(list); } k = 5; s = list.delete(k); StdOut.println("delete " + k + "th Element success: "+ s); StdOut.println(list); } }
测试数据:
to
be
or
not
to
输出结果:
insertAtBeginning success: to to insertAtBeginning success: be be to insertAtBeginning success: or or be to insertAtBeginning success: not not or be to insertAtBeginning success: to to not or be to delete 5th Element success: to to not or be delete 1th Element success: to not or be delete 1th Element success: not or be delete 1th Element success: or be delete 1th Element success: be Exception in thread "main" java.util.NoSuchElementException: LinkedList hasn‘t so many elements at com.qiusongde.linkedlist.LinkedList.delete(LinkedList.java:130) at com.qiusongde.linkedlist.Exercise1320.main(Exercise1320.java:32)
算法(Algorithms)第4版 练习 1.3.20
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